java.lang.NullPointerException: at com.milaboratory.mixcr.assembler.IO.write0(IO.java:122) at com.milaboratory.mixcr.assembler.IO.access$000(IO.java:45) at com.milaboratory.mixcr.assembler.IO$ReadToCloneMappingBtreeSerializer.serialize(IO.java:81) at org.mapdb.BTreeMap$NodeSerializer.serialize(BTreeMap.java:385) at org.mapdb.BTreeMap$NodeSerializer.serialize(BTreeMap.java:288) at org.mapdb.Store.serialize(Store.java:154) at org.mapdb.StoreDirect.put(StoreDirect.java:365) at org.mapdb.Caches$HashTable.put(Caches.java:216) at org.mapdb.Pump.buildTreeMap(Pump.java:470) at org.mapdb.DB.createTreeSet(DB.java:1072) at org.mapdb.DB$BTreeSetMaker.make(DB.java:749) at com.milaboratory.mixcr.cli.ActionAssemble.go(ActionAssemble.java:141) at com.milaboratory.mitools.cli.JCommanderBasedMain.main(JCommanderBasedMain.java:145)

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